Useful Conversions

Conversion tables
Filament diameter
European unit microns U.S. symbols inches
1 micron =  1/1,000 mm 5 D 0.00021
 = 0.001 mm 6 DE 0.00025
 = 0.00004 inch 7 E 0.00029
9 G 0.00036
10 H 0.00042
13 K 0.00051
14 L 0.00056
17 N 0.00068
24 T 0.00096
Turns per inch (TPI): 1 TPI = 40 turns per m (T/m)
Weight of yarn
Metric Yard Metric Yard
tex (g/1,000 m) h.y.p.p. (100 yds/1lb) tex (g/1,000 m) y.p.p. (yd/1lb)
2.8 1800 h.y.p.p. 160 tex 3100 y.p.p.
5.5 900 660 750
11 450 1100 450
22 225 1200 416
34 150 2400 207
68 75 4800 104
tex = 5,000/h.y.p.p. h.y.p.p. = 5,000/tex tex = 500,000/y.p.p y.p.p. = 500,000/tex
hundred yds per pound yds per pound exact: 496,238
Mass Force
1oz. = 28.35g 1g = 0.035oz. 1N = 0.102kgf = 0.225lbf
1lb = 0.454kg 1kg = 2.205lb
Length Area
1yd = 0.91m 1m = 1.09yd 1sq.yd. = 0.83 sq.m 1sq.m = 1.19 sq.yd.
1ft.(1/3yd) = 0.3048m 1m = 3.281ft. 1sq.ft. = 0.039 sq.m 1sq.m = 10.76 sq.ft.
1inch (1/12ft.) = 2.54cm 1cm = 0.39 inch
Density Temperature
1lb/in(3) = 27.68g/cm(3) 1g/cm(3) = 0.036lb/in(3) 1,000 degr.C = 1,832 degr.F
1lb/ft(3) = 0.0160g/cm(3) 1g/cm(3) = 62lb/ft.(3)
Comments
This conversion table is a guide and to our knowledge is accurate.